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If you're still getting pinging with 91 oct. timing curve is critical. It is not necessarily down to octane. I used to waste money on octane booster, until I figured out exactly what my motor needed, now it runs sweet and strong. I currently run with 14 deg. initial and 20 deg. crank plus about 4 deg. vacuum advance on top. I'm sure this is why Performance Dist. need as much info as possible so it's right the first time. Your current dist. may be way off base, so until you get that issue sorted, pining may just be the way it is. Maybe go with 11:1 comp ratio in your specs, but tell them that's a guess. I'm thinking it would be better to be too high on comp ratio than too low.Just my thoughts on this, not necessarily that of others.
If you're still getting pinging with 91 oct. timing curve is critical. It is not necessarily down to octane. I used to waste money on octane booster, until I figured out exactly what my motor needed, now it runs sweet and strong. I currently run with 14 deg. initial and 20 deg. crank plus about 4 deg. vacuum advance on top. I'm sure this is why Performance Dist. need as much info as possible so it's right the first time. Your current dist. may be way off base, so until you get that issue sorted, pining may just be the way it is. Maybe go with 11:1 comp ratio in your specs, but tell them that's a guess. I'm thinking it would be better to be too high on comp ratio than too low.
Just my thoughts on this, not necessarily that of others.
